#ifndef LLVM_RUNTIME_DYLD_IMPL_H
#define LLVM_RUNTIME_DYLD_IMPL_H
-#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/Twine.h"
#include "llvm/ADT/SmallVector.h"
-#include "llvm/ExecutionEngine/ExecutionEngine.h"
-#include "llvm/Support/Memory.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/system_error.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/ExecutionEngine/ObjectImage.h"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/SwapByteOrder.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/system_error.h"
+#include <map>
using namespace llvm;
+using namespace llvm::object;
namespace llvm {
+
+class ObjectBuffer;
+class Twine;
+
+
+/// SectionEntry - represents a section emitted into memory by the dynamic
+/// linker.
+class SectionEntry {
+public:
+ /// Name - section name.
+ StringRef Name;
+
+ /// Address - address in the linker's memory where the section resides.
+ uint8_t *Address;
+
+ /// Size - section size. Doesn't include the stubs.
+ size_t Size;
+
+ /// LoadAddress - the address of the section in the target process's memory.
+ /// Used for situations in which JIT-ed code is being executed in the address
+ /// space of a separate process. If the code executes in the same address
+ /// space where it was JIT-ed, this just equals Address.
+ uint64_t LoadAddress;
+
+ /// StubOffset - used for architectures with stub functions for far
+ /// relocations (like ARM).
+ uintptr_t StubOffset;
+
+ /// ObjAddress - address of the section in the in-memory object file. Used
+ /// for calculating relocations in some object formats (like MachO).
+ uintptr_t ObjAddress;
+
+ SectionEntry(StringRef name, uint8_t *address, size_t size,
+ uintptr_t objAddress)
+ : Name(name), Address(address), Size(size), LoadAddress((uintptr_t)address),
+ StubOffset(size), ObjAddress(objAddress) {}
+};
+
+/// RelocationEntry - used to represent relocations internally in the dynamic
+/// linker.
+class RelocationEntry {
+public:
+ /// SectionID - the section this relocation points to.
+ unsigned SectionID;
+
+ /// Offset - offset into the section.
+ uintptr_t Offset;
+
+ /// RelType - relocation type.
+ uint32_t RelType;
+
+ /// Addend - the relocation addend encoded in the instruction itself. Also
+ /// used to make a relocation section relative instead of symbol relative.
+ intptr_t Addend;
+
+ /// True if this is a PCRel relocation (MachO specific).
+ bool IsPCRel;
+
+ /// The size of this relocation (MachO specific).
+ unsigned Size;
+
+ RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend)
+ : SectionID(id), Offset(offset), RelType(type), Addend(addend),
+ IsPCRel(false), Size(0) {}
+
+ RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend,
+ bool IsPCRel, unsigned Size)
+ : SectionID(id), Offset(offset), RelType(type), Addend(addend),
+ IsPCRel(IsPCRel), Size(Size) {}
+};
+
+class RelocationValueRef {
+public:
+ unsigned SectionID;
+ intptr_t Addend;
+ const char *SymbolName;
+ RelocationValueRef(): SectionID(0), Addend(0), SymbolName(0) {}
+
+ inline bool operator==(const RelocationValueRef &Other) const {
+ return std::memcmp(this, &Other, sizeof(RelocationValueRef)) == 0;
+ }
+ inline bool operator <(const RelocationValueRef &Other) const {
+ return std::memcmp(this, &Other, sizeof(RelocationValueRef)) < 0;
+ }
+};
+
class RuntimeDyldImpl {
protected:
- unsigned CPUType;
- unsigned CPUSubtype;
-
// The MemoryManager to load objects into.
RTDyldMemoryManager *MemMgr;
- // For each section, we have a MemoryBlock of it's data.
- // Indexed by SectionID.
- SmallVector<sys::MemoryBlock, 32> Sections;
- // For each section, the address it will be considered to live at for
- // relocations. The same as the pointer to the above memory block for hosted
- // JITs. Indexed by SectionID.
- SmallVector<uint64_t, 32> SectionLoadAddress;
+ // A list of all sections emitted by the dynamic linker. These sections are
+ // referenced in the code by means of their index in this list - SectionID.
+ typedef SmallVector<SectionEntry, 64> SectionList;
+ SectionList Sections;
+
+ // Keep a map of sections from object file to the SectionID which
+ // references it.
+ typedef std::map<SectionRef, unsigned> ObjSectionToIDMap;
+
+ // A global symbol table for symbols from all loaded modules. Maps the
+ // symbol name to a (SectionID, offset in section) pair.
+ typedef std::pair<unsigned, uintptr_t> SymbolLoc;
+ typedef StringMap<SymbolLoc> SymbolTableMap;
+ SymbolTableMap GlobalSymbolTable;
+
+ // Pair representing the size and alignment requirement for a common symbol.
+ typedef std::pair<unsigned, unsigned> CommonSymbolInfo;
+ // Keep a map of common symbols to their info pairs
+ typedef std::map<SymbolRef, CommonSymbolInfo> CommonSymbolMap;
+
+ // For each symbol, keep a list of relocations based on it. Anytime
+ // its address is reassigned (the JIT re-compiled the function, e.g.),
+ // the relocations get re-resolved.
+ // The symbol (or section) the relocation is sourced from is the Key
+ // in the relocation list where it's stored.
+ typedef SmallVector<RelocationEntry, 64> RelocationList;
+ // Relocations to sections already loaded. Indexed by SectionID which is the
+ // source of the address. The target where the address will be written is
+ // SectionID/Offset in the relocation itself.
+ DenseMap<unsigned, RelocationList> Relocations;
+
+ // Relocations to external symbols that are not yet resolved. Symbols are
+ // external when they aren't found in the global symbol table of all loaded
+ // modules. This map is indexed by symbol name.
+ StringMap<RelocationList> ExternalSymbolRelocations;
+
+ typedef std::map<RelocationValueRef, uintptr_t> StubMap;
+
+ Triple::ArchType Arch;
- // Keep a map of starting local address to the SectionID which references it.
- // Lookup function for when we assign virtual addresses.
- DenseMap<void *, unsigned> SectionLocalMemToID;
+ inline unsigned getMaxStubSize() {
+ if (Arch == Triple::aarch64)
+ return 20; // movz; movk; movk; movk; br
+ if (Arch == Triple::arm || Arch == Triple::thumb)
+ return 8; // 32-bit instruction and 32-bit address
+ else if (Arch == Triple::mipsel || Arch == Triple::mips)
+ return 16;
+ else if (Arch == Triple::ppc64)
+ return 44;
+ else if (Arch == Triple::x86_64)
+ return 8; // GOT
+ else if (Arch == Triple::systemz)
+ return 16;
+ else
+ return 0;
+ }
- // Master symbol table. As modules are loaded and external symbols are
- // resolved, their addresses are stored here as a SectionID/Offset pair.
- typedef std::pair<unsigned, uint64_t> SymbolLoc;
- StringMap<SymbolLoc> SymbolTable;
+ inline unsigned getStubAlignment() {
+ if (Arch == Triple::systemz)
+ return 8;
+ else
+ return 1;
+ }
bool HasError;
std::string ErrorStr;
return true;
}
+ uint64_t getSectionLoadAddress(unsigned SectionID) {
+ return Sections[SectionID].LoadAddress;
+ }
+
uint8_t *getSectionAddress(unsigned SectionID) {
- return (uint8_t*)Sections[SectionID].base();
+ return (uint8_t*)Sections[SectionID].Address;
+ }
+
+ void writeInt16BE(uint8_t *Addr, uint16_t Value) {
+ if (sys::IsLittleEndianHost)
+ Value = sys::SwapByteOrder(Value);
+ *Addr = (Value >> 8) & 0xFF;
+ *(Addr+1) = Value & 0xFF;
+ }
+
+ void writeInt32BE(uint8_t *Addr, uint32_t Value) {
+ if (sys::IsLittleEndianHost)
+ Value = sys::SwapByteOrder(Value);
+ *Addr = (Value >> 24) & 0xFF;
+ *(Addr+1) = (Value >> 16) & 0xFF;
+ *(Addr+2) = (Value >> 8) & 0xFF;
+ *(Addr+3) = Value & 0xFF;
}
- void extractFunction(StringRef Name, uint8_t *StartAddress,
- uint8_t *EndAddress);
+ void writeInt64BE(uint8_t *Addr, uint64_t Value) {
+ if (sys::IsLittleEndianHost)
+ Value = sys::SwapByteOrder(Value);
+ *Addr = (Value >> 56) & 0xFF;
+ *(Addr+1) = (Value >> 48) & 0xFF;
+ *(Addr+2) = (Value >> 40) & 0xFF;
+ *(Addr+3) = (Value >> 32) & 0xFF;
+ *(Addr+4) = (Value >> 24) & 0xFF;
+ *(Addr+5) = (Value >> 16) & 0xFF;
+ *(Addr+6) = (Value >> 8) & 0xFF;
+ *(Addr+7) = Value & 0xFF;
+ }
+
+ /// \brief Given the common symbols discovered in the object file, emit a
+ /// new section for them and update the symbol mappings in the object and
+ /// symbol table.
+ void emitCommonSymbols(ObjectImage &Obj,
+ const CommonSymbolMap &CommonSymbols,
+ uint64_t TotalSize,
+ SymbolTableMap &SymbolTable);
+
+ /// \brief Emits section data from the object file to the MemoryManager.
+ /// \param IsCode if it's true then allocateCodeSection() will be
+ /// used for emits, else allocateDataSection() will be used.
+ /// \return SectionID.
+ unsigned emitSection(ObjectImage &Obj,
+ const SectionRef &Section,
+ bool IsCode);
+
+ /// \brief Find Section in LocalSections. If the secton is not found - emit
+ /// it and store in LocalSections.
+ /// \param IsCode if it's true then allocateCodeSection() will be
+ /// used for emmits, else allocateDataSection() will be used.
+ /// \return SectionID.
+ unsigned findOrEmitSection(ObjectImage &Obj,
+ const SectionRef &Section,
+ bool IsCode,
+ ObjSectionToIDMap &LocalSections);
+
+ // \brief Add a relocation entry that uses the given section.
+ void addRelocationForSection(const RelocationEntry &RE, unsigned SectionID);
+
+ // \brief Add a relocation entry that uses the given symbol. This symbol may
+ // be found in the global symbol table, or it may be external.
+ void addRelocationForSymbol(const RelocationEntry &RE, StringRef SymbolName);
+
+ /// \brief Emits long jump instruction to Addr.
+ /// \return Pointer to the memory area for emitting target address.
+ uint8_t* createStubFunction(uint8_t *Addr);
+
+ /// \brief Resolves relocations from Relocs list with address from Value.
+ void resolveRelocationList(const RelocationList &Relocs, uint64_t Value);
+
+ /// \brief A object file specific relocation resolver
+ /// \param RE The relocation to be resolved
+ /// \param Value Target symbol address to apply the relocation action
+ virtual void resolveRelocation(const RelocationEntry &RE, uint64_t Value) = 0;
+
+ /// \brief Parses the object file relocation and stores it to Relocations
+ /// or SymbolRelocations (this depends on the object file type).
+ virtual void processRelocationRef(unsigned SectionID,
+ RelocationRef RelI,
+ ObjectImage &Obj,
+ ObjSectionToIDMap &ObjSectionToID,
+ const SymbolTableMap &Symbols,
+ StubMap &Stubs) = 0;
+
+ /// \brief Resolve relocations to external symbols.
+ void resolveExternalSymbols();
+ virtual ObjectImage *createObjectImage(ObjectBuffer *InputBuffer);
public:
RuntimeDyldImpl(RTDyldMemoryManager *mm) : MemMgr(mm), HasError(false) {}
virtual ~RuntimeDyldImpl();
- virtual bool loadObject(MemoryBuffer *InputBuffer) = 0;
+ ObjectImage *loadObject(ObjectBuffer *InputBuffer);
void *getSymbolAddress(StringRef Name) {
// FIXME: Just look up as a function for now. Overly simple of course.
// Work in progress.
- if (SymbolTable.find(Name) == SymbolTable.end())
+ if (GlobalSymbolTable.find(Name) == GlobalSymbolTable.end())
return 0;
- SymbolLoc Loc = SymbolTable.lookup(Name);
+ SymbolLoc Loc = GlobalSymbolTable.lookup(Name);
return getSectionAddress(Loc.first) + Loc.second;
}
- virtual void resolveRelocations();
+ uint64_t getSymbolLoadAddress(StringRef Name) {
+ // FIXME: Just look up as a function for now. Overly simple of course.
+ // Work in progress.
+ if (GlobalSymbolTable.find(Name) == GlobalSymbolTable.end())
+ return 0;
+ SymbolLoc Loc = GlobalSymbolTable.lookup(Name);
+ return getSectionLoadAddress(Loc.first) + Loc.second;
+ }
+
+ void resolveRelocations();
- virtual void reassignSectionAddress(unsigned SectionID, uint64_t Addr) = 0;
+ void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
- void mapSectionAddress(void *LocalAddress, uint64_t TargetAddress);
+ void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress);
// Is the linker in an error state?
bool hasError() { return HasError; }
// Get the error message.
StringRef getErrorString() { return ErrorStr; }
- virtual bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const = 0;
+ virtual bool isCompatibleFormat(const ObjectBuffer *Buffer) const = 0;
+
+ virtual StringRef getEHFrameSection();
};
} // end namespace llvm
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